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Individual Calculations September 2009 |
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| Oosterom, Erik Total change: -24.45 | |   |
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| Intomart GfK Open 2009 | Hilversum | NED | 2009-06-28 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2217 | 2126 | 3.00 | 7 | 0.29 | 15 | 4.35 | |
|  Hendriks, Willy | m | | 2447 | NED | 0.00 | 1 | -0.13 | 15 | -1.95 | |  Strating, Sybolt | f | | 2328 | NED | 0.50 | 1 | 0.26 | 15 | 3.90 | | | Van Der Lende, Ilias | | | 2043 | NED | 0.50 | 1 | -0.11 | 15 | -1.65 | | | Dek, Lennart | | | 2179 | NED | 0.00 | 1 | -0.43 | 15 | -6.45 | | | Van Engen, Herman | | | 2163 | NED | 0.50 | 1 | 0.05 | 15 | 0.75 | | | Meurs, Tom | | | 2178 | NED | 0.50 | 1 | 0.07 | 15 | 1.05 | | | De Graaf, Dick | | | 2184 | NED | 1.00 | 1 | 0.58 | 15 | 8.70 | |
Rc - average rating of rated opponents, Ro - rating of a player in a tournament, Rp - rating performance of an unrated player, W - points won in a tournament against rated opponents, N - total number of games against rated opponents, Change - change used for calculation according to formula, K - development coefficient, Kchg - rating change of a player calculated as (K * change) | | | | 3e Leiden Chess Tournament | Leiden | NED | 2009-07-10 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2013 | 2128 | 4.00 | 8 | -1.22 | 15 | -18.30 | |
| | Schmit, Evert | | | 1872 | NED | 1.00 | 1 | 0.19 | 15 | 2.85 | | | Van Dongen, Cor | | | 2342 | NED | 0.00 | 1 | -0.23 | 15 | -3.45 | | | Sparreboom, Wil | | | 1977 | NED | 0.00 | 1 | -0.70 | 15 | -10.50 | | | Van Kempen, Roderick | | | 1982 | NED | 0.50 | 1 | -0.20 | 15 | -3.00 | | | Scherpenisse, Kees | | | 1981 | NED | 0.50 | 1 | -0.20 | 15 | -3.00 | | | Van Den Bergh, Ben | | | 2006 | NED | 0.50 | 1 | -0.17 | 15 | -2.55 | | | Weiland, Harro | | | 1968 | NED | 0.50 | 1 | -0.21 | 15 | -3.15 | | | De Swart, Sipke | | | 1979 | NED | 1.00 | 1 | 0.30 | 15 | 4.50 | |
Rc - average rating of rated opponents, Ro - rating of a player in a tournament, Rp - rating performance of an unrated player, W - points won in a tournament against rated opponents, N - total number of games against rated opponents, Change - change used for calculation according to formula, K - development coefficient, Kchg - rating change of a player calculated as (K * change) | | | | Hogeschool Zeeland Chess Tournament 2009 | Vlissingen | NED | 2009-08-01 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2097 | 2128 | 2.00 | 5 | -0.70 | 15 | -10.50 | |
| | Piasetski, Leon | m | | 2288 | CAN | 0.00 | 1 | -0.29 | 15 | -4.35 | | | Heltzel, Joost | c | | 2262 | NED | 0.00 | 1 | -0.32 | 15 | -4.80 | | | Westerman, Henk | | | 1938 | NED | 1.00 | 1 | 0.25 | 15 | 3.75 | | | Galle, Andre | | | 1983 | BEL | 0.50 | 1 | -0.19 | 15 | -2.85 | | | Zilverberg, Jasper | | | 2015 | NED | 0.50 | 1 | -0.15 | 15 | -2.25 | |
Rc - average rating of rated opponents, Ro - rating of a player in a tournament, Rp - rating performance of an unrated player, W - points won in a tournament against rated opponents, N - total number of games against rated opponents, Change - change used for calculation according to formula, K - development coefficient, Kchg - rating change of a player calculated as (K * change) | | |
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